Hi Aspose. We faced a strange issue. After updating library to a newest version some of shapes have different OfficeInteropShapeId. In the example you can see that the same shape have different OfficeInteropShapeId depending on the Aspose version used. Could you advise?
I have observed the issue shared by you and have created a ticket with ID SLIDESNET-41946 in our issue tracking system to further investigate and resolve the issue. This thread has been linked with the issue so that you may be notified once the issue will be fixed.
Also we discovered that when using 20.4 or 20.5 version of Aspose slides some elements are serializing in a different way. In 20.3 version when saving a presentation file containing textboxes with equations were serialized as a Shape, not as a mc:AlternateContent.
I have associated information in our issue tracking system and will share good news with you as soon as it will be fixed.
The issues you have found earlier (filed as SLIDESNET-41946) have been fixed in this update.